WO2012105489A1 - 面実装インダクタと面実装インダクタの製造方法 - Google Patents
面実装インダクタと面実装インダクタの製造方法 Download PDFInfo
- Publication number
- WO2012105489A1 WO2012105489A1 PCT/JP2012/051976 JP2012051976W WO2012105489A1 WO 2012105489 A1 WO2012105489 A1 WO 2012105489A1 JP 2012051976 W JP2012051976 W JP 2012051976W WO 2012105489 A1 WO2012105489 A1 WO 2012105489A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- coil
- core
- mount inductor
- surface mount
- winding
- Prior art date
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 10
- 238000004804 winding Methods 0.000 claims abstract description 27
- 239000006247 magnetic powder Substances 0.000 claims abstract description 10
- 239000011230 binding agent Substances 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims description 15
- 238000000748 compression moulding Methods 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 4
- 239000003566 sealing material Substances 0.000 claims description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 239000004020 conductor Substances 0.000 description 5
- 238000000465 moulding Methods 0.000 description 5
- 230000004907 flux Effects 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000003822 epoxy resin Substances 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 238000007747 plating Methods 0.000 description 2
- 229920000647 polyepoxide Polymers 0.000 description 2
- 238000005488 sandblasting Methods 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000010137 moulding (plastic) Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910052763 palladium Inorganic materials 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 229920006122 polyamide resin Polymers 0.000 description 1
- 229920013716 polyethylene resin Polymers 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 239000009719 polyimide resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000010301 surface-oxidation reaction Methods 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/02—Casings
- H01F27/022—Encapsulation
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/29—Terminals; Tapping arrangements for signal inductances
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F17/00—Fixed inductances of the signal type
- H01F17/04—Fixed inductances of the signal type with magnetic core
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F17/00—Fixed inductances of the signal type
- H01F17/04—Fixed inductances of the signal type with magnetic core
- H01F17/043—Fixed inductances of the signal type with magnetic core with two, usually identical or nearly identical parts enclosing completely the coil (pot cores)
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/2847—Sheets; Strips
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/29—Terminals; Tapping arrangements for signal inductances
- H01F27/292—Surface mounted devices
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/005—Impregnating or encapsulating
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F17/00—Fixed inductances of the signal type
- H01F17/04—Fixed inductances of the signal type with magnetic core
- H01F2017/048—Fixed inductances of the signal type with magnetic core with encapsulating core, e.g. made of resin and magnetic powder
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/4902—Electromagnet, transformer or inductor
- Y10T29/49071—Electromagnet, transformer or inductor by winding or coiling
Definitions
- the present invention relates to a small surface-mount inductor and a manufacturing method thereof.
- Surface mount inductors are widely used in which a coil around which a wire is wound is included in a core. With recent downsizing and thinning of electronic devices such as mobile phones, electronic components such as surface mount inductors are also required to be downsized and low profiled. Therefore, in the previously filed Japanese Patent Application Laid-Open No. 2010-245473, the applicant applied a small-sized wire using a coil and a pre-formed tablet in which a flat wire is wound around an outer and outer winding so that both ends thereof are drawn to the outer periphery. A surface mount inductor and its manufacturing method were proposed.
- the surface mount inductor disclosed in Japanese Patent Application Laid-Open No. 2010-245473 is set in a molding die with a coil in which a flat wire is wound around an outer and outer winding so that both ends thereof are drawn to the outer periphery. Then, compression molding is performed above the softening point of the tablet to obtain a molded body. External electrodes are formed from both side surfaces of the molded body using a method such as dipping. Therefore, as shown in FIG. 10, the external electrode 103 is formed over the five surfaces of the molded body 102. Therefore, the conventional surface mount inductor generally has an external electrode formed on the upper surface of the core.
- a surface-mount inductor having a bottom electrode structure is disclosed in Japanese Unexamined Patent Application Publication No. 2009-290076.
- a surface-mount inductor having a bottom electrode structure disclosed in Japanese Patent Application Laid-Open No. 2009-290076 has a coil 201 formed by winding a wire as shown in FIG. 11, and two lead terminals 201a of the coil 201 are formed on one surface (electrode forming surface). Then, the magnetic layer 202 protruding outward is formed. At this time, the coil 201 is sealed so that the winding axis of the coil 201 is orthogonal to the electrode forming surface.
- the external electrode 203 is formed at a predetermined position on the electrode formation surface, and a surface-mount inductor having a bottom electrode structure is manufactured.
- the coil is arranged so that the winding axis of the coil is orthogonal to the electrode forming surface, so that the positional relationship between the internal structure of the coil and the external electrode is asymmetric. That is, if the left and right sides are mounted while being mounted on the circuit board, the winding start position and the winding end position are reversed. When the positions of the coil start and end are reversed, the direction of the generated magnetic flux is also reversed, which affects peripheral components.
- the surface mount inductor of the present invention has a coil formed by winding a rectangular conductor wire around an outer and outer winding (wound so that both ends of the conductor wire are at the outermost periphery), and mainly a magnetic wire. It has a core made of a powder and a binder, and an external electrode formed on one surface of the core. The coil is included in the core so that the winding axis of the coil is parallel to the surface of the core on which the external electrode is formed.
- the surface mount inductor of the present invention can increase the area of the core and winding by the thickness of the electrode other than the mounting surface as compared with the conventional surface mount inductor, the L value, DC resistance, DC superposition characteristics, etc. This is advantageous in terms of characteristics.
- the positional relationship between the internal coil structure and the external electrode is symmetric. That is, the winding direction of the coil with respect to the circuit board is the same whether it is on the left or right.
- the surface-mounted inductor of the present invention is mounted on the circuit board with the left and right being switched, the direction of the generated magnetic flux is constant, so there is no need to consider the directionality during mounting.
- the perspective view of the air-core coil used with the surface mount inductor of 1st Example of this invention The perspective view of the preforming body of the surface mount inductor of 1st Example of this invention.
- the figure explaining the manufacturing process of the surface mount inductor of 1st Example of this invention The perspective view which shows the sealing structure of the coil of the surface mount inductor of 1st Example of this invention.
- 1 is a perspective view of a surface mount inductor according to a first embodiment of the present invention.
- FIG. The perspective view of the air-core coil used with the surface mount inductor of 2nd Example of this invention.
- the figure explaining the manufacturing process of the surface mount inductor of 2nd Example of this invention The perspective view of the surface mount inductor of 2nd Example of this invention.
- the perspective view explaining the conventional surface mount inductor The perspective view explaining the surface mount inductor of the conventional bottom face electrode structure.
- FIG. 1 is a perspective view of an air core coil used in the surface mount inductor according to the first embodiment of the present invention.
- FIG. 2 shows a perspective view of a preform used in the surface mount inductor of the present invention.
- 3 and 5 show the manufacturing process of the surface mount inductor according to the first embodiment of the present invention.
- FIG. 4 shows the coil sealing structure of the surface mount inductor according to the first embodiment of the present invention.
- FIG. 6 is a perspective view of the surface mount inductor according to the first embodiment of the present invention.
- a rectangular conductor wire having a self-bonding film is wound in two stages (both ends).
- the air-core coil 1 was obtained by winding in a two-stage spiral shape so as to be drawn to the outer periphery. At this time, both end portions 1a of the air-core coil 1 are drawn out to the same side surface side.
- the sealing material obtained by mixing the iron-based metal magnetic powder and the epoxy resin is preformed to form a preformed body 2 provided with the convex portions 2a and the guide portions 2b as shown in FIG.
- the air core coil 1 is placed on the preform 2 so that the projection 2 a of the preform 2 and the hollow portion of the air coil are fitted.
- another preform 2 is placed thereon.
- the end portion 1 a of the air-core coil 1 is pulled out along the guide portion 2 b of the preform 2.
- it is set in a cavity of a molding die and compression molded at 150 ° C. to obtain a core 3 as shown in FIG.
- the air core coil 1 is included in the core 3 such that both end portions 1 a of the coil 1 are exposed on the surface of the core 3 parallel to the winding axis of the air core coil 1.
- the surface from which both end portions 1a are exposed serves as the electrode forming surface of the core 3 (the bottom surface portion of the surface mount inductor).
- the conductive paste 4 is transferred onto the electrode forming surface of the core 3 and cured. As a result, the conductive paste 4 and the internal air core coil 1 are electrically connected. Finally, plating is performed to form the external electrode 5 on the surface of the conductor paste 4 to obtain a surface mount inductor as shown in FIG. Note that the electrode formed by plating may be formed by appropriately selecting one or a plurality of electrodes such as Ni, Sn, Cu, Au, and Pd.
- FIG. 7 is a perspective view of an air core coil used in the surface mount inductor according to the second embodiment of the present invention.
- FIG. 8 shows a manufacturing process of the surface mount inductor according to the second embodiment of the present invention.
- FIG. 9 is a perspective view of a surface mount inductor according to a second embodiment of the present invention. In addition, description of the part which overlaps with 1st Example is omitted.
- a rectangular conductor having a self-bonding film having an insulating film is wound into two stages of outer and outer windings (both ends thereof are drawn to the outer periphery) using a square columnar core.
- an air-core coil 6 was obtained.
- both end portions 6a of the air-core coil 6 were pulled out to the same side.
- the core 7 enclosing the air-core coil 6 is obtained by compression molding in the same manner as in the first embodiment.
- both end portions 6 a of the coil are exposed on the surface of the core 7 parallel to the winding axis of the air-core coil 6.
- the surface where both end portions 6a are exposed serves as the electrode forming surface of the core 7.
- Sand blasting is performed to remove burrs and remove the coating on the exposed surfaces of both end portions 6a.
- the conductive paste 8 is transferred onto the electrode forming surface to be electrically connected to the internal air-core coil 6.
- the external electrode 9 in which the metal frame is processed is pasted with the conductive paste 8, and the conductive paste 8 is cured to obtain the surface mount inductor shown in FIG.
- iron-based metal magnetic powder was used as the magnetic powder as the sealing material, and epoxy resin was used as the binder.
- epoxy resin was used as the binder.
- iron-based metal magnetic powder By using iron-based metal magnetic powder, a surface-mount inductor having excellent DC superposition characteristics can be produced.
- the present invention is not limited thereto, and for example, ferrite magnetic powder or the like as magnetic powder, or magnetic powder subjected to surface modification such as insulation film formation or surface oxidation may be used.
- an inorganic substance such as glass powder may be added.
- a thermosetting resin such as polyimide resin or phenol resin, a thermoplastic resin such as polyethylene resin or polyamide resin, an inorganic binder, or the like may be used as the binder.
- an air coil having an oval and rectangular outer and outer windings was created.
- the present invention is not limited to this, and shapes other than fixed-width figures such as an ellipse, a fan, and a semicircle are used. Alternatively, a trapezoidal, polygonal shape, or a combination of them may be used. This prevents the rotation of the air-core coil during molding.
- the manufactured surface-mount inductor provides structural stability during mounting and realizes a low profile. Moreover, you may have a magnetic core instead of an air core coil.
- the core is created by using the compression molding method which is one of the plastic molding methods.
- the core is not limited to this and may be created by using a molding method such as a powder molding method.
- the transfer method is adopted as a method for applying the conductive paste, but the method is not limited to this, and a method such as application by a dispenser or a dip method may be used.
- a method such as application by a dispenser or a dip method may be used.
- the sandblast was used as a method of peeling the membrane
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Manufacturing & Machinery (AREA)
- Coils Or Transformers For Communication (AREA)
- Manufacturing Cores, Coils, And Magnets (AREA)
Abstract
Description
図1~図6を参照しながら、本発明の面実装インダクタの第1実施例を説明する。図1に本発明の第1実施例の面実装インダクタで用いる空心コイルの斜視図を示す。図2に本発明の面実装インダクタで用いる予備成形体の斜視図を示す。図3および図5に本発明の第1実施例の面実装インダクタの製造工程を示す。図4に本発明の第1実施例の面実装インダクタのコイルの封止構造を示す。図6に本発明の第1実施例の面実装インダクタの斜視図を示す。
図7~図9を参照しながら、本発明の面実装インダクタの第2実施例を説明する。図7に本発明の第2実施例の面実装インダクタで用いる空心コイルの斜視図を示す。図8に本発明の第2実施例の面実装インダクタの製造工程を示す。図9に本発明の第2実施例の面実装インダクタの斜視図を示す。なお、第1実施例と重複する部分の説明は割愛する。
Claims (5)
- 断面が平角形状の導線を巻回してなるコイルと、
主として磁性粉末と結合材とからなるコアと、
該コアの1つの表面に形成された外部電極と、を有し、
該コイルの導線の端部の両方が該コイルの最外周となるようにし、
該コイルの巻軸が該外部電極の形成されるコアの表面に対して平行となるように該コイルを該コアに内包する
ことを特徴とする面実装インダクタ。 - 前記コイルの形状が定幅図形を除く形状であることを特徴とする請求項1記載の面実装インダクタ。
- 前記コイルの形状が長円、楕円、長方形のいずれかであることを特徴とする請求項2に記載の面実装インダクタ。
- 平角導線を外外巻きに巻回してコイルを作成する工程、
主として磁性粉末と結合材とからなる封止材で該コイルを封止してコアを形成する工程であって、該コイルの両端部が該コアの1つの表面上に露出し、該端部が露出する表面に対して該コイルの巻軸が平行となるように封止する、前記工程、
該端部の露出する該コアの表面に外部電極を形成する工程
を含むことを特徴とする面実装インダクタの製造方法。 - 前記コアを形成する工程は、
前記封止材を用いて予備成形体を形成する工程、
該予備成形体と前記コイルとを圧縮成形によって一体化させる工程
を含むことを特徴とする請求項4に記載の面実装インダクタの製造方法。
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020137012120A KR20130139993A (ko) | 2011-01-31 | 2012-01-30 | 면실장 인덕터와 면실장 인덕터의 제조 방법 |
US13/982,990 US20130307655A1 (en) | 2011-01-31 | 2012-01-30 | Surface Mount Inductor and Method for Producing Surface Mount Inductor |
CN2012800071307A CN103339695A (zh) | 2011-01-31 | 2012-01-30 | 表面安装电感器和表面安装电感器的制造方法 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2011017581A JP2012160507A (ja) | 2011-01-31 | 2011-01-31 | 面実装インダクタと面実装インダクタの製造方法 |
JP2011-017581 | 2011-01-31 |
Publications (1)
Publication Number | Publication Date |
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WO2012105489A1 true WO2012105489A1 (ja) | 2012-08-09 |
Family
ID=46602703
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2012/051976 WO2012105489A1 (ja) | 2011-01-31 | 2012-01-30 | 面実装インダクタと面実装インダクタの製造方法 |
Country Status (6)
Country | Link |
---|---|
US (1) | US20130307655A1 (ja) |
JP (1) | JP2012160507A (ja) |
KR (1) | KR20130139993A (ja) |
CN (1) | CN103339695A (ja) |
TW (1) | TWI581277B (ja) |
WO (1) | WO2012105489A1 (ja) |
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US20140062638A1 (en) * | 2012-08-31 | 2014-03-06 | Toko, Inc. | Surface-mount inductor and production method thereof |
JP2014225590A (ja) * | 2013-05-17 | 2014-12-04 | 東光株式会社 | 面実装インダクタの製造方法 |
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US20170125158A1 (en) * | 2014-07-18 | 2017-05-04 | Murata Manufacturing Co., Ltd. | Surface mounted inductor and manufacturing method therefor |
WO2017115604A1 (ja) * | 2015-12-28 | 2017-07-06 | 株式会社村田製作所 | 表面実装インダクタ及びその製造方法 |
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Also Published As
Publication number | Publication date |
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JP2012160507A (ja) | 2012-08-23 |
TWI581277B (zh) | 2017-05-01 |
CN103339695A (zh) | 2013-10-02 |
KR20130139993A (ko) | 2013-12-23 |
TW201239918A (en) | 2012-10-01 |
US20130307655A1 (en) | 2013-11-21 |
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